* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8e8e8;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --border-color: #d0d0d0;
    --accent: #0078d4;
    --accent-hover: #106ebe;
    --success: #107c10;
    --error: #d13438;
    --warning: #ff8c00;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    font-size: 14px;
    line-height: 1.5;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

.header h1 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.header-nav {
    display: flex;
    gap: 16px;
    align-items: center;
}

.header-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    padding: 6px 12px;
    border-radius: 4px;
    transition: all 0.2s;
}

.header-nav a:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
    font-size: 13px;
}

.user-info .role {
    background: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: 3px;
    font-size: 11px;
    text-transform: uppercase;
}

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 32px;
    width: 100%;
    max-width: 360px;
    box-shadow: var(--shadow);
}

.login-box h1 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    text-align: center;
}

.login-box p {
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: 24px;
    text-align: center;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    background: var(--bg-secondary);
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: #d8d8d8;
}

.btn-danger {
    background: var(--error);
    color: white;
}

.btn-danger:hover {
    background: #c42f33;
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover {
    background: #0b6b0b;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-block {
    display: block;
    width: 100%;
}

.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    font-size: 16px;
    font-weight: 600;
}

.card-body {
    padding: 20px;
}

.alert {
    padding: 12px 16px;
    border-radius: 4px;
    margin-bottom: 16px;
    font-size: 13px;
}

.alert-success {
    background: #dff6dd;
    color: var(--success);
    border: 1px solid #107c10;
}

.alert-error {
    background: #fde7e9;
    color: var(--error);
    border: 1px solid #d13438;
}

.alert-info {
    background: #e1f5fe;
    color: #0277bd;
    border: 1px solid #0277bd;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
}

.table tbody tr:hover {
    background: var(--bg-primary);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

.badge {
    display: inline-block;
    padding: 3px 8px;
    font-size: 11px;
    font-weight: 500;
    border-radius: 3px;
    text-transform: uppercase;
}

.badge-success {
    background: #dff6dd;
    color: var(--success);
}

.badge-error {
    background: #fde7e9;
    color: var(--error);
}

.badge-warning {
    background: #fff4ce;
    color: var(--warning);
}

.badge-info {
    background: #e1f5fe;
    color: #0277bd;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.file-item:last-child {
    border-bottom: none;
}

.file-info {
    flex: 1;
}

.file-name {
    font-weight: 500;
    margin-bottom: 4px;
}

.file-meta {
    font-size: 12px;
    color: var(--text-secondary);
}

.file-actions {
    display: flex;
    gap: 8px;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 4px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.upload-area:hover {
    border-color: var(--accent);
    background: var(--bg-primary);
}

.upload-area p {
    color: var(--text-secondary);
    margin-top: 8px;
}

.link-box {
    background: var(--bg-tertiary);
    padding: 12px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 12px;
    word-break: break-all;
    display: flex;
    align-items: center;
    gap: 8px;
}

.link-box input {
    flex: 1;
    background: none;
    border: none;
    font-family: monospace;
    font-size: 12px;
}

.link-box button {
    padding: 4px 8px;
    font-size: 11px;
}

.tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.tabs a {
    padding: 12px 20px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: all 0.2s;
}

.tabs a:hover {
    color: var(--text-primary);
}

.tabs a.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 16px;
    text-align: center;
}

.stat-value {
    font-size: 28px;
    font-weight: 600;
    color: var(--accent);
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 4px;
    padding: 24px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.modal-header {
    margin-bottom: 16px;
}

.modal-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.modal-footer {
    margin-top: 20px;
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.hidden {
    display: none;
}